also referred to as a blowfish; big head.
John: "Hey Jack, look there's a reso in the lake.

Jack: "Wow, it's body so small but head so big!"
by anthonyjondoe1111 November 11, 2014
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Nickname of Montreal's vast underground city (largest in the world).
When we were in Montreal, we walked around the Reso for hours – shopping and eating – without going above ground.
by bobtheman October 15, 2013
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